DSL Router second PC problem

I have just installed DSL at my home. This is ADSL I believe, single line, noise filters for phones, modem and phones can be used at same time. Modem is a Paradyne 6310-A4-200, Router is Linksys BEF SR41. Both PC's are winXP. They are in opposite ends of house.

I have the Modem/Router setup working on one PC.

After running cable through the walls, around the garage and through the floor I added the RJ45 cat5 ends, approx 100'. When I tried to hook up the PC I got a consistent flashing of the lights for that port about a 1 second interval. When the connection is working I get a steady show of lights. I assumed that I screwed up the ends as I could not check them with my RJ45 patch check meter.

I pulled the patch cable back through the house enough to get the ends together and they showed the correct continuity according to the meter. ie, 1-1, 2-2 etc. I then checked the cable that was working and it showed the same continuity. I wanted to ensure it wasn't a crossover cable. I then tried the 100' cable in the PC that was working and got the same light flashing problem and the PC showing a LAN connection unplugged status.

I then assumed that perhaps my wire had a bad section so I built another 100' cable with the same results.

I know that I have built longer cables at work out of the same wire and connections. I have never had a problem with cables this long.

Any ideas? Does a home Linksys router deliver a weaker signal than my work Cisco routers that it can't carry a signal approx 100'? I am think wireless but would prefer not to purchase another router as I already have this one. Thanks in advance. AlasKen

 

pppOe setup in router or still running off that one pc?
anyway that's the most common furball.
actually having ppOe one both will do that for sure
stupid friend kenny proved that.